x11-toolkits/p5-Prima: fix build on 32-bits

img/codec_Xpm.c:635:21: error: incompatible function pointer types assigning to 'Bool (*)(PImgCodec, PImgLoadFileInstance)' (aka 'long (*)(struct ImgCodec *, struct _ImgLoadFileInstance *)') from 'int (PImgCodec, PImgLoadFileInstance)' (aka 'int (struct ImgCodec *, struct _ImgLoadFileInstance *)') [-Wincompatible-function-pointer-types]
        vmt. load          = load;
                           ^ ~~~~
img/codec_Xpm.c:639:21: error: incompatible function pointer types assigning to 'Bool (*)(PImgCodec, PImgSaveFileInstance)' (aka 'long (*)(struct ImgCodec *, struct _ImgSaveFileInstance *)') from 'int (PImgCodec, PImgSaveFileInstance)' (aka 'int (struct ImgCodec *, struct _ImgSaveFileInstance *)') [-Wincompatible-function-pointer-types]
        vmt. save          = save;
                           ^ ~~~~

x11-toolkits/p5-Prima/Makefile

@@ -58,6 +58,8 @@ XFT_CONFIGURE_OFF=	WITH_XFT=0
 XFT_CONFIGURE_ON=	WITH_XFT=1
 XFT_USE=		XORG=xft
 
+CFLAGS+=	-Wno-error=incompatible-function-pointer-types
+
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/${SITE_ARCH_REL}/auto/Prima/Prima.so
 	@${REINPLACE_CMD} -e 's|${STAGEDIR}||' ${STAGEDIR}${PREFIX}/${SITE_ARCH_REL}/Prima/Config.pm